Kieren

Hello. I've just bought an arc pro Le Mans 24h set. I have 3 cars. when I first set it up I could run 2 cars, but after I set up the 3rd car it always set the amount of drivers to 4, the 3 drivers I have created and a pace car. When I reduce the amount of drivers to 3 or 2 it always includes a pace car. I don't want the pace car, how do I turn this off? basically I want to race with 3 human drivers. I appreciate any help thanks